It is like he is expected to join Manchester United in case of leaving. After a long time it would be interesting to watch him playing for them again. His old times there weren't very impressive to tell the truth. However we aren't watching the same Depay anymore as well. He is much more productive than those times when he has the chance. He is just unlucky now that Lewandowski is here and he can't find many chances in the starting eleven as a result. Xavi wants him to stay anyway because he won't have any striker alternative left other than Lewandowski if Depay leaves.
Depay was brought to Barcelona because there was a good chemistry between the then coach of Barcelona, Ronald Koeman and Depay. Both had a good cooperation in the Dutch national team. However, Depay is not of a world class, and was made better by Koeman than he actually was. It also has a reason that he is always on the couch. He was close to a transfer to Juventus in the summer, but that did not happen for financial reasons. Of course there are always a few clubs that are interested in Depay, but he should not assume that many European top clubs are. Then you should rather think of Subtop clubs. The most important thing is that he will play football again in the base.